collect, bring together
攏 centers on gathering scattered things into one place: collecting items or bringing people together.
攏 combines 扌 (hand) with 龍, which likely contributes the sound and may suggest gathering like a dragon collecting treasures, though the exact historical motivation is uncertain.
A hand 扌 beside a dragon 龍: imagine using your hand to collect all the dragon's scattered scales into one pile.
For ロウ, picture a low table where you gather all the collected items: low -> ロウ, and your hand brings everything together on the low surface.